JSON configuration syntax not working on sequenceDiagram

[Wauro21]

Problem:

Using the JSON configuration parameters to customize the symbol, i.e. showing an actor in a sequenceDiagram, results in a Unrecognized text error on the preview.

Example

Following the docs' example: Sequence Diagrams on the actors section:

sequenceDiagram
    participant Alice@{ "type" : "boundary" }
    participant Bob
    Alice->>Bob: Request from boundary
    Bob->>Alice: Response to boundary

Results on the following error on the preview window:

Lexical error on line 2. Unrecognized text.
...ram    participant Alice@{ "type" : "bo
----------------------^

Additional information

• VS-Code version 1.114.0
• mermaid-preview extension version: 2.1.2

Online version

This was reported and fixed on the online version: mermaid-js/mermaid#6935 but hasn't been fixed on the preview extension